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package sqlite_test
import (
"fmt"
"os"
"time"
"zombiezen.com/go/sqlite"
)
// This example shows the basic use of a backup object.
func ExampleBackup() {
// Open database connections.
src, err := sqlite.OpenConn(os.Args[1])
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
defer src.Close()
dst, err := sqlite.OpenConn(os.Args[2])
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
defer func() {
if err := dst.Close(); err != nil {
fmt.Fprintln(os.Stderr, err)
}
}()
// Create Backup object.
backup, err := sqlite.NewBackup(dst, "main", src, "main")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
// Perform online backup/copy.
_, err1 := backup.Step(-1)
err2 := backup.Close()
if err1 != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
if err2 != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
// This example shows how to use Step
// to prevent holding a read lock on the source database
// during the entire copy.
func ExampleBackup_Step() {
// Open database connections.
src, err := sqlite.OpenConn(os.Args[1])
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
defer src.Close()
dst, err := sqlite.OpenConn(os.Args[2])
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
defer func() {
if err := dst.Close(); err != nil {
fmt.Fprintln(os.Stderr, err)
}
}()
// Create Backup object.
backup, err := sqlite.NewBackup(dst, "main", src, "main")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
defer func() {
if err := backup.Close(); err != nil {
fmt.Fprintln(os.Stderr, err)
}
}()
// Each iteration of this loop copies 5 database pages,
// waiting 250ms between iterations.
for {
more, err := backup.Step(5)
if !more {
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
break
}
time.Sleep(250 * time.Millisecond)
}
}
|
